Diagnosis_Species: Corydoras hastatus Eigenmann & Eigenmann. Depth of body 2 3/4 in the length, lenath of head 3 1/3. Diameter of eye 3 1/2 in length of head and 2 in interorbital width. Barbels not extending beyond eye. Dorsal 7-8; spino nearly as long as head. Anal 7-8. Pectoral spine a litle longer than dorsal spine. Scutes 22/20; humeral shields not in contact below. Light brown; a jet-black lateral baud ending at base of caudal in a large arrow-shaped split, bordered posteriorly with white and again with a narrow blackish margin; minute black points on body and fins.

Body_male_length: 3.0 cm
Body_female_length: 3.0 cm

Etymology

Corydoras: from the Ancient Greek κόρυς (korus), meaning ‘helmet’, and δορά (dora), meaning ‘skin, hide of an animal’, in allusion to the rows of bony plates on the flanks of genus members.hastatus: from the Latin hastatus, meaning ‘bearing a spear’, presumably in reference to the “arrow-shaped spot” on the caudal peduncle of this species.

Type species

The type species of the genus Corydoras is Corydoras geoffroy (Lacépède, 1803).

Ecology

Habitat: Estuarine
Habitat: Coastal
Habitat: According to current knowledge this species has an extensive distribution when compared with most other members of the genus. While the type locality is located on the Amazon main channel, between Sanatrém and Manaus in Amazonas state, Brazil, records also exist from elsewhere in Amazonas state (rio Urubu and floodplain lakes in the vicinity of Manaus), plus Pará state further downstream, Pando, Beni, and Santa Cruz departments in northern and eastern Bolivia (ríos Iténez/Guaporé, Yacuma, Itonomas, Piraí, and Orthon watersheds within the larger Madeira river basin), throughout the Río Paraguay system in southern Brazil (Mato Grosso do Sul state), Paraguay and northeastern Argentina (including ríos Pilcomayo, Confuso, Jejuí Guazú, Manduvirá, and Tebicuary), at least as far south as the confluence of the Río Paraguay with the Río Paraná.
Temperature: 22-24 °C
Temperature_spawning: 22-23 °C
pH: 6.0-7.5
Sociability_adults: gregarious
Substrate: water
Salinity: freshwater
Oxygen_level: Oxic
Migratory: no

Life cycle

Longevity: more than 3 years (15-25 years)
Reproduction_mode: sexual
Spawning_method: External fertilization in the water column
Sexual_dimorphism: Females tend to grow larger, and sexually mature individuals are noticeably broader and deeper-bodied than males.

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This web site was designed by Laure Guillou and Fabrice Not (Biological station of Roscoff, CNRS, France). Contributions or suggestions are very welcome and can be submitted either to Laure Guillou or to Fabrice Not.